The drill in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental _____ and severe cold.
| A．concerns |
| B．assumption |
| C．occupations |
| D．ignorance |
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The drill in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental _____ and severe cold.
| A．concerns |
| B．assumption |
| C．occupations |
| D．ignorance |
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